Firebox arrangement for furnaces



July 16,1929. A. 'r. SHIPSTEAD FIREBOX ARRANGEMENT FOR FURNACES Filed Oct. 10, 1927 40V R .Y m? m 9 R L Patented July 16, 1929.

UNE'E'ED STATES ALFRED T. SHIPSTEAD, OF DETROIT, MICHIGAN.

FIREBOX ARRANGEMENT FOR FURIQ'ACES.

Application filed October 10, 1927. Serial No. 225,110.

This invention relates to improvements in firebox arrangements for furnaces.

It is an object of the invention to provide a firebox arrangement consisting of vertical members which extend from the base to the top of the furnace within, and spaced from, the side walls of therlatter. These vertical members are positioned towards each end of the furnace on each side of the latter and have passages through them, above the grate level, to support a plurality of substantially horizontal and longitudinally arranged fire box side wall sections between each pair of which downwardly and inwardly inclined openings are provided. In this manner air is permitted to rise between the sides of the furnace and the side wall sections. As the air rises it becomes heated and is then drawn down through the openings onto the top of the fire. Thus additional preheated air is introduced onto the top of the fire, to assist in consuming unburnt products of combustion.

Another object of the invention is to provide a firebox arrangement wherein the bars are pivotally mounted on supports which rest on projections on the vertical members so that the bars may be turned against one another to almost completely eliminate the entrance of air between the bars. When this is done it is found that sufficient top draft is obtained through the openings to present the discharge of any considerable amount of smoke.

A further object of the invention is to provide side wall sections having water pas sages through them, so that the sections may also be employed for water heating purposes.

With these and other objects in view which will become apparent as the specification. proceeds the invention is hereinafter more fully described with the aid of the accompanying drawings, in which:

Figure 1 illustrates a cross section of, a furnace equipped with the invention, and

Figure 2 shows a section on the line 2-2 of Figure 1.

Figure 3 depicts a cross section of a somewhat modified form of construction, and

Figure l is a section on the line 44 of Figure 3.

Figure 5 is a disassembled v lew of a detail, and

Figure 6 is a perspectlve View of one of also secured to the said furnace.

ry cross members 5 on which the bars 6 rest, and above the grate level the members are provided with a plurality of openings 7 to support the ends of wall sections 8 or 8 in horizontal spaced relation to one another, so that downwardly and inwardly inclined passages 9 occur between each pair of wall sections.

It will be noted in Figures 1 and 2 that the side wall sections 8 are solid whereas in Figures 8 and et passages 10 extend through the side Wall sections 8 so that water may be heated therein, In Figures 1 and 2 the side wall sections 8 extend to the back and front wall of the furnace whereas in the other construction room must be provided for the built-up return bends ll between the ends of the side wall sections and the front and rear furnace walls. In the latter case therefore back and front walls 12 and 12 are bolted, or otherwise secured, to the ends of the sections 8 As will be noted from Figure 5 the ends of the hollow sections have nipples l3 thereon which project through the back wall 12 so that connection may be readily made to the return bends. 15 designates a removable plate or door over the firing opening 16 in the front plate 12 and 20 indicates an aperture through the front of the casing opposite said firing opening. In Figures 1 and 2 an apertureQO is provided through the front of the casing at and below the grate bar level for the admission of air.

- From the foregoing description it will be clearly seen that air circulates around the inner sides of the furnaces, is warmed by contact with the side wall sections, and is drawn down onto the top of the fire. More over the bars 6 are preferably so arranged that they may be turned one against an other so that bottom draft is to a very large extent excluded, as, under many conditions, top draft alone through the passages 9 gives more satisfactory results.

l/Vhile in the description the preferred embodiments of the invention have been described and shown, it is understood that these constructions are subject to such modifications as fall Within the scope of the appended claims.

What I claim as my invention and desire to secure by Letters Patent is:

1. In a furnace, the combination of :1 casing having a'closed top and an aperture through the front thereof, four vertical members Within said casing extending to the top thereof and having a plurality of openings therethrough, horizontal cross members carried by said vertical members, grate bars having their ends supported by said cross members, side Wall sections spaced vertically one above the other the lowest of which on each side is substantially level with said grate bars, and the ends of said Wall sections taking into said vertical member openings.

2. In a furnace, the combination o'f'a cas ing having a closed top and an aperture through the front thereof, four vertical members Within said casing extendingto the top thereof and having a plurality of openings therethrough, horizontal cross members carried by said vertical members, grate bars having their ends supported by said cross members, side Wall sections spaced vertically one above the other the lowest on each side being substantially level with said grate bars, the ends of said Wall sections taking into said vertical member openings,

and front and rear Walls arranged Within the casing transversely between the front pair and rear pair respectively of said vertical members, said front Wall having aiii-mg opening therethrough.

ALFRED T. SHIPSTEAD. 

